Add document approval workflow

Introduce a complete approval system for document publishing. Document
versions can now require approval from selected reviewers before being
published, with automatic publishing once all approvers have approved.

- Add approval quorum and decision tables with backfill migration
- Implement request approval, approve, and reject flows with electronic
  signature support for approve decisions
- Add employee approvals page with dedicated tab and pending approvals view
- Add changelog field to publish and request approval flows
- Pre-select previous version's approvers in the publish dialog
- Show quorum approvers in document list with 100 approver hard limit
- Expose approval workflow through GraphQL, MCP, and CLI
- Remove legacy default approvers feature entirely
- Add comprehensive e2e test coverage for approval workflows

Signed-off-by: Sacha Al Himdani <sacha@getprobo.com>

apps/console/src/hooks/forms/useDocumentForm.tsx

@@ -5,7 +5,6 @@ import { useFormWithSchema } from "../useFormWithSchema";
 export const documentSchema = z.object({
   title: z.string().min(1, "Title is required"),
   content: z.string().min(1, "Content is required"),
-  approverIds: z.array(z.string()).min(1, "At least one approver is required"),
   documentType: z.enum(["OTHER", "GOVERNANCE", "POLICY", "PROCEDURE", "PLAN", "REGISTER", "RECORD", "REPORT", "TEMPLATE"]),
   classification: z.enum(["PUBLIC", "INTERNAL", "CONFIDENTIAL", "SECRET"]),
 });